Abstract: A drive shaft includes a first annular wall and a second annular wall joined together via a friction-welded portion. The first annular wall and the second annular wall have outer diameters of 30 to 50 mm and wall thicknesses of 3 to 5 mm. A burr created at the friction-welded portion has a connection radius of greater than or equal to 0.5 mm, a base radius of greater than or equal to 0.5 mm, a burr base angle of less than or equal to 40°, and a burr slope length of 0.2 to 5 mm.

Abstract: An airbag for protecting an occupant includes a panel forming the airbag and having an occupant counter surface with a head counter portion to face a head of the occupant when the airbag is inflated. A recess portion is formed in the head counter portion when the airbag is inflated. The airbag also includes a regulation member for regulating inflation of the head counter portion toward the occupant. The regulation member forms the recess portion by regulating inflation of the head counter portion toward the occupant upon inflation of the airbag. The regulation member is configured to release regulation after a predetermined time from a moment when the airbag starts inflation.

Abstract: An airbag for protecting an occupant includes a panel forming the airbag and having an occupant counter surface with a head counter portion to face a head of the occupant when the airbag is inflated. A recess portion is formed in the head counter portion when the airbag is inflated. The airbag also includes a regulation member for regulating inflation of the head counter portion toward the occupant. The regulation member forms the recess portion by regulating inflation of the head counter portion toward the occupant upon inflation of the airbag. The regulation member is configured to release regulation after a predetermined time from a moment when the airbag starts inflation.

Abstract: A vehicle occupant protection system includes: a seat belt apparatus including a shoulder belt (11) and a lap belt (13); an upper air bag (27, 113); a lower air bag (29, 67, 73, 83); and an inflation limiting structure (37, 53, 55, 57, 75, 85) which is provided in the lower air bag and limits inflation of a part of the lower air bag in a vehicle back-and-forth direction when the lower air bag is inflated. When the vehicle collision is detected or predicted, the upper and lower air bags are inflated and vertically come into contact with each other. Further, an upper part (41, 71, 79, 91) of the inflated lower air bag positioned above the inflation limiting structure is pressed by the upper air bag and bends toward the front of the vehicle at the inflation limiting structure.

Abstract: A vehicle occupant protection system includes: a seat belt apparatus including a shoulder belt (11) and a lap belt (13); an upper air bag (27, 113); a lower air bag (29, 67, 73, 83); and an inflation limiting structure (37, 53, 55, 57, 75, 85) which is provided in the lower air bag and limits inflation of a part of the lower air bag in a vehicle back-and-forth direction when the lower air bag is inflated. When the vehicle collision is detected or predicted, the upper and lower air bags are inflated and vertically come into contact with each other. Further, an upper part (41, 71, 79, 91) of the inflated lower air bag positioned above the inflation limiting structure is pressed by the upper air bag and bends toward the front of the vehicle at the inflation limiting structure.

Abstract: A method of manufacturing a hollow circuit substrate, of two metal sheets brazed to each other in a laminated state with a bulging hollow circuit for ed between the two metal sheets. Of the upper and lower metal sheets for forming the hollow circuit, a circuit-forming bulging portion is formed in the upper metal sheet. A flux suspension is applied by screen printing to the upper surface of the lower metal sheet so as not to overlap the circuit-forming bulging portion to form flux films. The two metal sheets are stacked on each other so as to close off the opening of the circuit-forming bulging portion and are brazed to each other. This method prevents flux from remaining in a hollow circuit of a manufactured hollow circuit substrate.

Abstract: A heat exchanger is provided in which high heat transfer efficiency has been attained by optimizing the slit array and setting an optimum range for the width of a slit and the spacing between slits. Slits 51 and 52 formed in front of the heat transfer coil 4 and slits 55 and 56 formed behind the heat transfer coil are arranged so as to provide a mutually different length among adjoining partitioned slits in the vertical direction, as well as a mutually different length between directly opposite partitioned slits in the horizontal direction. As a result, the position at which the slit is partitioned is staggered.

Abstract: A heat exchanger is provided in which high heat transfer efficiency has been attained by optimizing the slit array and setting an optimum range for the width of a slit and the spacing between slits. Slits 51 and 52 formed in front of the heat transfer coil 4 and slits 55 and 56 formed behind the heat transfer coil are arranged so as to provide a mutually different length among adjoining partitioned slits in the vertical direction, as well as a mutually different length between directly opposite partitioned slits in the horizontal direction. As a result, the position at which the slit is partitioned is staggered. The two slits 53 and 54 formed side by side between heat transfer coil 4 and heat transfer coil 4 are of the same length. For a 7 mm diameter heat transfer coil, the slit width relative to the diameter of the heat transfer coil ranges from 1.2/7 (approximately 0.17) to 2.0/7 (approximately 0.29), and the slit spacing relative to the diameter of the heat transfer coil ranges from 1.

Abstract: A corrosion-resistant and brazeable aluminum material. has an aluminum core, and a thermally sprayed layer formed on the core is composed of a brazing metal intermingled with zinc or its alloy. The brazing metal may be a mixture of aluminum and silicon, an aluminum-silicon alloy, a blend of the mixture with the alloy, or silicon. The brazeable aluminum material may be produced by blending a first powder of the brazing metal with a second powder of a corrosion resistant substance including zinc, so as to prepare a powder mixture, and then thermally spraying the powder mixture onto the aluminum core.